# Copyright 2016, Tresys Technology, LLC # Copyright 2017, Chris PeBenito <pebenito@ieee.org> # # SPDX-License-Identifier: LGPL-2.1-only # from typing import NamedTuple from ..policyrep import Context, Nodecon from .context import ContextWrapper from .descriptors import DiffResultDescriptor from .difference import Difference, Wrapper class ModifiedNodecon(NamedTuple): """Difference details for a modified netifcon.""" rule: Nodecon added_context: Context removed_context: Context class NodeconsDifference(Difference): """Determine the difference in nodecons between two policies.""" added_nodecons = DiffResultDescriptor("diff_nodecons") removed_nodecons = DiffResultDescriptor("diff_nodecons") modified_nodecons = DiffResultDescriptor("diff_nodecons") def diff_nodecons(self) -> None: """Generate the difference in nodecons between the policies.""" self.log.info("Generating nodecon differences from {0.left_policy} to {0.right_policy}". format(self)) self.added_nodecons, self.removed_nodecons, matched_nodecons = self._set_diff( (NodeconWrapper(n) for n in self.left_policy.nodecons()), (NodeconWrapper(n) for n in self.right_policy.nodecons())) self.modified_nodecons = [] for left_nodecon, right_nodecon in matched_nodecons: # Criteria for modified nodecons # 1. change to context if ContextWrapper(left_nodecon.context) != ContextWrapper(right_nodecon.context): self.modified_nodecons.append(ModifiedNodecon(left_nodecon, right_nodecon.context, left_nodecon.context)) # # Internal functions # def _reset_diff(self) -> None: """Reset diff results on policy changes.""" self.log.debug("Resetting nodecon differences") self.added_nodecons = None self.removed_nodecons = None self.modified_nodecons = None class NodeconWrapper(Wrapper[Nodecon]): """Wrap nodecon statements for diff purposes.""" __slots__ = ("ip_version", "network") def __init__(self, ocon: Nodecon) -> None: self.origin = ocon self.ip_version = ocon.ip_version self.network = ocon.network self.key = hash(ocon) def __hash__(self): return self.key def __lt__(self, other): return self.origin < other.origin def __eq__(self, other): return self.ip_version == other.ip_version and \ self.network == other.network